nix-config/sdcard/sd-image-init.nix
2024-05-24 14:03:22 -04:00

63 lines
2.2 KiB
Nix

{ config, pkgs, ... }:
{
# Adapted from https://github.com/NixOS/nixpkgs/blob/e89ecac0a26cdf4546298c565e880f00d4ab8649/nixos/modules/virtualisation/amazon-init.nix
systemd.services.sd-image-init = {
description = "Reconfigure the system from SD image userdata on startup";
wantedBy = [ "multi-user.target" ];
after = [ "multi-user.target" ];
requires = [ "network-online.target" ];
restartIfChanged = false;
unitConfig.X-StopOnRemoval = false;
script = ''
#!${pkgs.runtimeShell} -eu
echo "attempting to fetch configuration from SD image user data..."
export HOME=/root
export PATH=${pkgs.lib.makeBinPath [ config.nix.package pkgs.systemd pkgs.gnugrep pkgs.git pkgs.gnutar pkgs.gzip pkgs.gnused config.system.build.nixos-rebuild config.system.build.nixos-generate-config]}:$PATH
export NIX_PATH=nixpkgs=/nix/var/nix/profiles/per-user/root/channels/nixos:nixos-config=/etc/nixos/configuration.nix:/nix/var/nix/profiles/per-user/root/channels
userData=/etc/sd-image-metadata/configuration.nix
userDataExtra=/etc/sd-image-metadata/sd-image-init.nix
if [ -s "$userData" ]; then
# If the user-data looks like it could be a nix expression,
# copy it over. Also, look for a magic three-hash comment and set
# that as the channel.
if sed '/^\(#\|SSH_HOST_.*\)/d' < "$userData" | grep -q '\S'; then
channels="$(grep '^###' "$userData" | sed 's|###\s*||')"
while IFS= read -r channel; do
echo "writing channel: $channel"
done < <(printf "%s\n" "$channels")
if [[ -n "$channels" ]]; then
printf "%s" "$channels" > /root/.nix-channels
nix-channel --update
fi
echo "generating hardware configuration"
nixos-generate-config
echo "setting configuration from SD image user data"
cp "$userData" "$userDataExtra" /etc/nixos/
else
echo "user data does not appear to be a Nix expression; ignoring"
exit
fi
else
echo "no user data is available"
exit
fi
nixos-rebuild switch
'';
serviceConfig = {
Type = "oneshot";
RemainAfterExit = true;
};
};
}